Process of producing printing-surfaces.



PATENTED APR. 24, 1906? H. BARTH.

PROCESS OF PRODUCING PRINTING SURFACES.

APPLICATION FILED JAN. 20, 1905.

Q Vii-Hum y M %w awww W y UNITED STATES PATENT OFFICE.

PROCESS OF PRODUCING PRINTING-SURFACES.

Specification of Letters Patent.

Patented April 24, 1906.

Application filed January 20, 1905. Serial No. 241,928.

To all whom it may concern:

Be it known that I, HENRY BARTH, a citizen of the United States of America, and a resident of Cincinnati, county of Hamilton, State of Ohio, have invented certain new and useful Improvements in Process of Producing Printing-Surfaces, of which the following is a specification.

The objects of my invention are a printingsurface for reproducing photographs, washdrawings, paintings, pictures, linedrawings, &c., and a process of making the same.

The process is described in the specification in connection with the accompanying drawings, which illustrate the apparatus and the type.

Figure 1 is a detail plan view of the matrix for forming the printing-surface. Fig. 2 is a front elevation of the printing-surface embodying my invention. Fig. 3 is a side elevation of the printing-plate. Fig. 4 is a central sectional view of the matrix upon line a; w of Fig. I. Fig. 5 is a similar view taken though the mold in which the printing-plate is forn'ied.

Referring to the parts, the matrix consists of a block A, having secured thereon a frame (L, having a central opening a. Between plate A and -frame a a way is left in which is seated the face-plate B of the matrix.

Upon the face of plate B the ima e to be reproduced has been impressed. This may be done by any of the well-known processes, such as etching or by printing from a photo graphic negative upon a sensitized metal plate and then etching in acid, producing a plate known to the trade as a half-tone. The plate so formed is then inserted in the way in the matrix, so as to form the faceplate thereof. The matrix having been set in the mold, the molten metal is forced into the mold, and the face 0 of the printing-plate C will contain projections corresponding to the minutest depressions in the faceplate of the matrix.

The mold I have illustrated in Fig. 5 is the one which is described in Letters Patent No. 708,010, granted to me September 2, 1902* that is, when the plunger D is drawn downward the molten metal flows into the vacuum thereby produced through the channel 6.

This printing-plate may be used in printing in the same manner that the ordinary printers type is used.

\Vhat I claim is- 1. The process of making a printing-surface which consists in etching an image upon a metal plate, inserting the plate as the matrix in a mold and then bringing the molten metal into the mold.

2. The process of making a printing-surface consisting of forming a negative of a picture upon a metal plate, inserting the plate as a matrix in a mold and bringing the molten metal into the mold.

HENRY BARTII.

\Vitnesses:

HARRY SHEAR, WVALTER F. MURRAY. 

